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Emergency Monopropellant Auxiliary Power Units for Large Commercial Aircraft 690659

This paper discusses the use of liquid monopropellant powered turbopumps designed to provide emergency hydraulic power for large commercial aircraft. This type of equipment has been used in the past in missile hydraulic power supplies, and the application to aircraft emergency use represents no major changes or advances in technology. Fuel selection criteria, decomposition chamber design, turbine design, and gearbox layout are discussed as well as the control system. The integration of this type of equipment into other power producing units is briefly described.